APA (7th ed.) Citation

Lennes, N. J., & Veblen, O. (2006). Introduction to Infinitesimal Analysis; Functions of One Real Variable. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lennes, N. J., and Oswald Veblen. Introduction to Infinitesimal Analysis; Functions of One Real Variable. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Lennes, N. J., and Oswald Veblen. Introduction to Infinitesimal Analysis; Functions of One Real Variable. Project Gutenberg, 2006.

Warning: These citations may not always be 100% accurate.